# std::to_wstring

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< cpp‎ | string‎ | basic string

Defined in header `<string>` |  |
std::wstring to_wstring( int value ); | (1) | (since C++11)
std::wstring to_wstring( long value ); | (2) | (since C++11)
std::wstring to_wstring( long long value ); | (3) | (since C++11)
std::wstring to_wstring( unsigned value ); | (4) | (since C++11)
std::wstring to_wstring( unsigned long value ); | (5) | (since C++11)
std::wstring to_wstring( unsigned long long value ); | (6) | (since C++11)
std::wstring to_wstring( float value ); | (7) | (since C++11)
std::wstring to_wstring( double value ); | (8) | (since C++11)
std::wstring to_wstring( long double value ); | (9) | (since C++11)

Converts a numeric value to std::wstring.

Let `buf` be an internal to the conversion functions buffer, sufficiently large to contain the result of conversion. 1) Converts a signed decimal integer to a wide string as if by std::swprintf(buf, sz, L"%d", value). 2) Converts a signed decimal integer to a wide string as if by std::swprintf(buf, sz, L"%ld", value). 3) Converts a signed decimal integer to a wide string as if by std::swprintf(buf, sz, L"%lld", value). 4) Converts an unsigned decimal integer to a wide string as if by std::swprintf(buf, sz, L"%u", value). 5) Converts an unsigned decimal integer to a wide string as if by std::swprintf(buf, sz, L"%lu", value). 6) Converts an unsigned decimal integer to a wide string as if by std::swprintf(buf, sz, L"%llu", value). 7,8) Converts a floating point value to a wide string as if by std::swprintf(buf, sz, L"%f", value). 9) Converts a floating point value to a wide string as if by std::swprintf(buf, sz, L"%Lf", value). | (until C++26)
1-9) Converts a numeric value to a wide string as if by std::format(L"{}", value). | (since C++26)

### Parameters

value | - | a numeric value to convert

### Return value

A wide string holding the converted value.

### Exceptions

May throw std::bad_alloc from the std::wstring constructor.

### Example

Run this code

    #include <iostream>
    #include <string>

    int main()
    {
        for (const double f : {23.43, 1e-9, 1e40, 1e-40, 123456789.0})
            std::wcout << "std::wcout: " << f << '\n'
                       << "to_wstring: " << std::to_wstring(f) << "\n\n";
    }

Output:

    std::wcout: 23.43
    to_wstring: 23.430000

    std::wcout: 1e-09
    to_wstring: 0.000000

    std::wcout: 1e+40
    to_wstring: 10000000000000000303786028427003666890752.000000

    std::wcout: 1e-40
    to_wstring: 0.000000

    std::wcout: 1.23457e+08
    to_wstring: 123456789.000000

### See also

to_string (C++11) | converts an integral or floating-point value to `string` (function)

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